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Stop Working and Preserve Your Energy
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If Point F were added to the pendulum opposite of Point B, how much KE and PE would it have?
KE = 60 J PE = 90 J
What causes kinetic energy to change to thermal energy?
Friction
A squirrel does 550,000 J of work in lifting an 50,000 N acorn. How high did it lift the acorn?
11 m
Why do point A and E have the highest GPE?
A and E are the highest off of the ground, therefore they have the furthest to fall.
What is the PE in point C?
130 J
What is measured in Newtons?
Force
What is the mass of a bird perched on a 5-m branch with 147 J of gravitational potential energy?
3 kg
A cheetah has a mass of 80 kg and a kinetic energy of 6000 J. What is the cheetah’s speed?
12.24 m/s
What type of energy is stored in a rubber band?
Elastic Energy
What type of energy is stored in chemical bonds, such as in food or gasoline?
Chemical Energy
You push an ice block with a force of 200 N. If you move it 10 m, how much work did you do on it?
2000 J
What is the value acceleration of gravity on earth?
9.8 m/s2
What is the height of a phone with a mass of 0.15 kg that has a GPE of 90 J.
61.2 m
A jogger whose mass is 75 kg is moving at a speed of 3 m/s. What is the jogger’s kinetic energy?
337.5 J
You do 900 J of work while moving a sofa. If it took you 5 seconds to move the sofa, how much power did you generate?
180 W
Define power (include the unit of measurement).
The rate at which work is done Watts
What occurs when a force moves an object over a distance and is measured in joules?
Work
What is the total (or sum) of potential & kinetic energy for an object?
Mechanical Energy
What is defined as, "the energy of motion?"
Kinetic Energy
Gravitational Potential Energy is defined as?
The amount of energy stored in an object that can fall
If the height of an object changes, the amount of what changes?
Gravitational Potential Energy
Height is measured in what units?
meters
The law of conservation of energy states:
the total amount of energy will remain constant and energy can't be created or destroyed.
What vocabulary word means, "the unit of measurement for energy."
joules
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